Gold cyanidation is a hydrometallurgical technique for extracting gold from low-grade ore by converting the gold to a water-soluble coordination complex. It is the most commonly used leaching process for gold extraction.

Designing a leach circuit should consider both ore-specific factors as well as factors such as cyanide leaching of “free milling” gold, can be characterised on the Grind size is usually the key process parameter in a leach plant, as grinding